Solar USB Charger 2.0

FeaturedContest Winner

Step 4: Circuit Diagram

Picture of Circuit Diagram

Above is a circuit diagram for this project. It's designed so that the solar cell is always charging the batteries and the toggle switch turns the USB circuit on/off.

A diode has been put in place to prevent power from flowing the wrong direction into the solar cell. This is a very common diagram for solar.

This basic setup can easily be scaled up or down depending on the project.

Remove these adsRemove these ads by Signing Up

Get More Out of Instructables

Already have an Account?


PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!